diff --git a/avogadro/qtplugins/surfaces/surfaces.cpp b/avogadro/qtplugins/surfaces/surfaces.cpp
index 05f5cd6586..87071bced1 100644
--- a/avogadro/qtplugins/surfaces/surfaces.cpp
+++ b/avogadro/qtplugins/surfaces/surfaces.cpp
@@ -144,7 +144,7 @@ bool Surfaces::handleCommand(const QString& command, const QVariantMap& options)
       cubeResolution = res;
   }
   if (options.contains("isovalue") &&
-      options["isolvalue"].canConvert<float>()) {
+      options["isovalue"].canConvert<float>()) {
     bool ok;
     float iso = options["isovalue"].toFloat(&ok);
     if (ok)
@@ -165,7 +165,7 @@ bool Surfaces::handleCommand(const QString& command, const QVariantMap& options)
         expression = name.remove("homo", Qt::CaseInsensitive);
       } else if (name.contains("lumo", Qt::CaseInsensitive)) {
         index = homo + 1; // again modified by the expression
-        expression = name.remove("homo", Qt::CaseInsensitive);
+        expression = name.remove("lumo", Qt::CaseInsensitive);
       }
       // modify HOMO / LUMO based on "+ number" or "- number"
       if (expression.contains('-')) {